The SEFA Group has been making a positive difference by recycling coal combustion residuals into environmentally sustainable ... products for the concrete industry for over 40 years, recycling over 20 million tons of fly ash that otherwise would have been disposed of in landfills or ponds. SEFA's proprietary thermal beneficiation process, STAR Technology, was the first technology in the world to process coal ash from ponds on a commercial scale. read more